Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1247 insertions, 0 deletions

diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c
new file mode 100644
index 000000000000..7b74c87b569e
--- /dev/null
+++ b/drivers/message/i2o/i2o_block.c
@@ -0,0 +1,1247 @@
+/*
+ *      Block OSM
+ *
+ *      Copyright (C) 1999-2002 Red Hat Software
+ *
+ *      Written by Alan Cox, Building Number Three Ltd
+ *
+ *      This program is free software; you can redistribute it and/or modify it
+ *      under the terms of the GNU General Public License as published by the
+ *      Free Software Foundation; either version 2 of the License, or (at your
+ *      option) any later version.
+ *
+ *      This program is distributed in the hope that it will be useful, but
+ *      WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *      General Public License for more details.
+ *
+ *      For the purpose of avoiding doubt the preferred form of the work
+ *      for making modifications shall be a standards compliant form such
+ *      gzipped tar and not one requiring a proprietary or patent encumbered
+ *      tool to unpack.
+ *
+ *      Fixes/additions:
+ *              Steve Ralston:
+ *                      Multiple device handling error fixes,
+ *                      Added a queue depth.
+ *              Alan Cox:
+ *                      FC920 has an rmw bug. Dont or in the end marker.
+ *                      Removed queue walk, fixed for 64bitness.
+ *                      Rewrote much of the code over time
+ *                      Added indirect block lists
+ *                      Handle 64K limits on many controllers
+ *                      Don't use indirects on the Promise (breaks)
+ *                      Heavily chop down the queue depths
+ *              Deepak Saxena:
+ *                      Independent queues per IOP
+ *                      Support for dynamic device creation/deletion
+ *                      Code cleanup
+ *                      Support for larger I/Os through merge* functions
+ *                      (taken from DAC960 driver)
+ *              Boji T Kannanthanam:
+ *                      Set the I2O Block devices to be detected in increasing
+ *                      order of TIDs during boot.
+ *                      Search and set the I2O block device that we boot off
+ *                      from as the first device to be claimed (as /dev/i2o/hda)
+ *                      Properly attach/detach I2O gendisk structure from the
+ *                      system gendisk list. The I2O block devices now appear in
+ *                      /proc/partitions.
+ *              Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *                      Minor bugfixes for 2.6.
+ */
+
+#include <linux/module.h>
+#include <linux/i2o.h>
+
+#include <linux/mempool.h>
+
+#include <linux/genhd.h>
+#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+
+#include "i2o_block.h"
+
+#define OSM_NAME        "block-osm"
+#define OSM_VERSION     "$Rev$"
+#define OSM_DESCRIPTION "I2O Block Device OSM"
+
+static struct i2o_driver i2o_block_driver;
+
+/* global Block OSM request mempool */
+static struct i2o_block_mempool i2o_blk_req_pool;
+
+/* Block OSM class handling definition */
+static struct i2o_class_id i2o_block_class_id[] = {
+        {I2O_CLASS_RANDOM_BLOCK_STORAGE},
+        {I2O_CLASS_END}
+};
+
+/**
+ *      i2o_block_device_free - free the memory of the I2O Block device
+ *      @dev: I2O Block device, which should be cleaned up
+ *
+ *      Frees the request queue, gendisk and the i2o_block_device structure.
+ */
+static void i2o_block_device_free(struct i2o_block_device *dev)
+{
+        blk_cleanup_queue(dev->gd->queue);
+
+        put_disk(dev->gd);
+
+        kfree(dev);
+};
+
+/**
+ *      i2o_block_remove - remove the I2O Block device from the system again
+ *      @dev: I2O Block device which should be removed
+ *
+ *      Remove gendisk from system and free all allocated memory.
+ *
+ *      Always returns 0.
+ */
+static int i2o_block_remove(struct device *dev)
+{
+        struct i2o_device *i2o_dev = to_i2o_device(dev);
+        struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev);
+
+        osm_info("Device removed %s\n", i2o_blk_dev->gd->disk_name);
+
+        i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0);
+
+        del_gendisk(i2o_blk_dev->gd);
+
+        dev_set_drvdata(dev, NULL);
+
+        i2o_device_claim_release(i2o_dev);
+
+        i2o_block_device_free(i2o_blk_dev);
+
+        return 0;
+};
+
+/**
+ *      i2o_block_device flush - Flush all dirty data of I2O device dev
+ *      @dev: I2O device which should be flushed
+ *
+ *      Flushes all dirty data on device dev.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_flush(struct i2o_device *dev)
+{
+        struct i2o_message __iomem *msg;
+        u32 m;
+
+        m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+        if (m == I2O_QUEUE_EMPTY)
+                return -ETIMEDOUT;
+
+        writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+        writel(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev->lct_data.tid,
+               &msg->u.head[1]);
+        writel(60 << 16, &msg->body[0]);
+        osm_debug("Flushing...\n");
+
+        return i2o_msg_post_wait(dev->iop, m, 60);
+};
+
+/**
+ *      i2o_block_device_mount - Mount (load) the media of device dev
+ *      @dev: I2O device which should receive the mount request
+ *      @media_id: Media Identifier
+ *
+ *      Load a media into drive. Identifier should be set to -1, because the
+ *      spec does not support any other value.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id)
+{
+        struct i2o_message __iomem *msg;
+        u32 m;
+
+        m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+        if (m == I2O_QUEUE_EMPTY)
+                return -ETIMEDOUT;
+
+        writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+        writel(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev->lct_data.tid,
+               &msg->u.head[1]);
+        writel(-1, &msg->body[0]);
+        writel(0, &msg->body[1]);
+        osm_debug("Mounting...\n");
+
+        return i2o_msg_post_wait(dev->iop, m, 2);
+};
+
+/**
+ *      i2o_block_device_lock - Locks the media of device dev
+ *      @dev: I2O device which should receive the lock request
+ *      @media_id: Media Identifier
+ *
+ *      Lock media of device dev to prevent removal. The media identifier
+ *      should be set to -1, because the spec does not support any other value.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id)
+{
+        struct i2o_message __iomem *msg;
+        u32 m;
+
+        m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+        if (m == I2O_QUEUE_EMPTY)
+                return -ETIMEDOUT;
+
+        writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+        writel(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid,
+               &msg->u.head[1]);
+        writel(-1, &msg->body[0]);
+        osm_debug("Locking...\n");
+
+        return i2o_msg_post_wait(dev->iop, m, 2);
+};
+
+/**
+ *      i2o_block_device_unlock - Unlocks the media of device dev
+ *      @dev: I2O device which should receive the unlocked request
+ *      @media_id: Media Identifier
+ *
+ *      Unlocks the media in device dev. The media identifier should be set to
+ *      -1, because the spec does not support any other value.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id)
+{
+        struct i2o_message __iomem *msg;
+        u32 m;
+
+        m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
+        if (m == I2O_QUEUE_EMPTY)
+                return -ETIMEDOUT;
+
+        writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+        writel(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev->lct_data.tid,
+               &msg->u.head[1]);
+        writel(media_id, &msg->body[0]);
+        osm_debug("Unlocking...\n");
+
+        return i2o_msg_post_wait(dev->iop, m, 2);
+};
+
+/**
+ *      i2o_block_device_power - Power management for device dev
+ *      @dev: I2O device which should receive the power management request
+ *      @operation: Operation which should be send
+ *
+ *      Send a power management request to the device dev.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_device_power(struct i2o_block_device *dev, u8 op)
+{
+        struct i2o_device *i2o_dev = dev->i2o_dev;
+        struct i2o_controller *c = i2o_dev->iop;
+        struct i2o_message __iomem *msg;
+        u32 m;
+        int rc;
+
+        m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
+        if (m == I2O_QUEUE_EMPTY)
+                return -ETIMEDOUT;
+
+        writel(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
+        writel(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev->lct_data.
+               tid, &msg->u.head[1]);
+        writel(op << 24, &msg->body[0]);
+        osm_debug("Power...\n");
+
+        rc = i2o_msg_post_wait(c, m, 60);
+        if (!rc)
+                dev->power = op;
+
+        return rc;
+};
+
+/**
+ *      i2o_block_request_alloc - Allocate an I2O block request struct
+ *
+ *      Allocates an I2O block request struct and initialize the list.
+ *
+ *      Returns a i2o_block_request pointer on success or negative error code
+ *      on failure.
+ */
+static inline struct i2o_block_request *i2o_block_request_alloc(void)
+{
+        struct i2o_block_request *ireq;
+
+        ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC);
+        if (!ireq)
+                return ERR_PTR(-ENOMEM);
+
+        INIT_LIST_HEAD(&ireq->queue);
+
+        return ireq;
+};
+
+/**
+ *      i2o_block_request_free - Frees a I2O block request
+ *      @ireq: I2O block request which should be freed
+ *
+ *      Fres the allocated memory (give it back to the request mempool).
+ */
+static inline void i2o_block_request_free(struct i2o_block_request *ireq)
+{
+        mempool_free(ireq, i2o_blk_req_pool.pool);
+};
+
+/**
+ *      i2o_block_sglist_alloc - Allocate the SG list and map it
+ *      @ireq: I2O block request
+ *
+ *      Builds the SG list and map it into to be accessable by the controller.
+ *
+ *      Returns the number of elements in the SG list or 0 on failure.
+ */
+static inline int i2o_block_sglist_alloc(struct i2o_block_request *ireq)
+{
+        struct device *dev = &ireq->i2o_blk_dev->i2o_dev->iop->pdev->dev;
+        int nents;
+
+        nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table);
+
+        if (rq_data_dir(ireq->req) == READ)
+                ireq->sg_dma_direction = PCI_DMA_FROMDEVICE;
+        else
+                ireq->sg_dma_direction = PCI_DMA_TODEVICE;
+
+        ireq->sg_nents = dma_map_sg(dev, ireq->sg_table, nents,
+                                    ireq->sg_dma_direction);
+
+        return ireq->sg_nents;
+};
+
+/**
+ *      i2o_block_sglist_free - Frees the SG list
+ *      @ireq: I2O block request from which the SG should be freed
+ *
+ *      Frees the SG list from the I2O block request.
+ */
+static inline void i2o_block_sglist_free(struct i2o_block_request *ireq)
+{
+        struct device *dev = &ireq->i2o_blk_dev->i2o_dev->iop->pdev->dev;
+
+        dma_unmap_sg(dev, ireq->sg_table, ireq->sg_nents,
+                     ireq->sg_dma_direction);
+};
+
+/**
+ *      i2o_block_prep_req_fn - Allocates I2O block device specific struct
+ *      @q: request queue for the request
+ *      @req: the request to prepare
+ *
+ *      Allocate the necessary i2o_block_request struct and connect it to
+ *      the request. This is needed that we not loose the SG list later on.
+ *
+ *      Returns BLKPREP_OK on success or BLKPREP_DEFER on failure.
+ */
+static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req)
+{
+        struct i2o_block_device *i2o_blk_dev = q->queuedata;
+        struct i2o_block_request *ireq;
+
+        /* request is already processed by us, so return */
+        if (req->flags & REQ_SPECIAL) {
+                osm_debug("REQ_SPECIAL already set!\n");
+                req->flags |= REQ_DONTPREP;
+                return BLKPREP_OK;
+        }
+
+        /* connect the i2o_block_request to the request */
+        if (!req->special) {
+                ireq = i2o_block_request_alloc();
+                if (unlikely(IS_ERR(ireq))) {
+                        osm_debug("unable to allocate i2o_block_request!\n");
+                        return BLKPREP_DEFER;
+                }
+
+                ireq->i2o_blk_dev = i2o_blk_dev;
+                req->special = ireq;
+                ireq->req = req;
+        } else
+                ireq = req->special;
+
+        /* do not come back here */
+        req->flags |= REQ_DONTPREP | REQ_SPECIAL;
+
+        return BLKPREP_OK;
+};
+
+/**
+ *      i2o_block_delayed_request_fn - delayed request queue function
+ *      delayed_request: the delayed request with the queue to start
+ *
+ *      If the request queue is stopped for a disk, and there is no open
+ *      request, a new event is created, which calls this function to start
+ *      the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never
+ *      be started again.
+ */
+static void i2o_block_delayed_request_fn(void *delayed_request)
+{
+        struct i2o_block_delayed_request *dreq = delayed_request;
+        struct request_queue *q = dreq->queue;
+        unsigned long flags;
+
+        spin_lock_irqsave(q->queue_lock, flags);
+        blk_start_queue(q);
+        spin_unlock_irqrestore(q->queue_lock, flags);
+        kfree(dreq);
+};
+
+/**
+ *      i2o_block_reply - Block OSM reply handler.
+ *      @c: I2O controller from which the message arrives
+ *      @m: message id of reply
+ *      qmsg: the actuall I2O message reply
+ *
+ *      This function gets all the message replies.
+ *
+ */
+static int i2o_block_reply(struct i2o_controller *c, u32 m,
+                           struct i2o_message *msg)
+{
+        struct i2o_block_request *ireq;
+        struct request *req;
+        struct i2o_block_device *dev;
+        struct request_queue *q;
+        u8 st;
+        unsigned long flags;
+
+        /* FAILed message */
+        if (unlikely(le32_to_cpu(msg->u.head[0]) & (1 << 13))) {
+                struct i2o_message *pmsg;
+                u32 pm;
+
+                /*
+                 * FAILed message from controller
+                 * We increment the error count and abort it
+                 *
+                 * In theory this will never happen.  The I2O block class
+                 * specification states that block devices never return
+                 * FAILs but instead use the REQ status field...but
+                 * better be on the safe side since no one really follows
+                 * the spec to the book :)
+                 */
+                pm = le32_to_cpu(msg->body[3]);
+                pmsg = i2o_msg_in_to_virt(c, pm);
+
+                req = i2o_cntxt_list_get(c, le32_to_cpu(pmsg->u.s.tcntxt));
+                if (unlikely(!req)) {
+                        osm_err("NULL reply received!\n");
+                        return -1;
+                }
+
+                ireq = req->special;
+                dev = ireq->i2o_blk_dev;
+                q = dev->gd->queue;
+
+                req->errors++;
+
+                spin_lock_irqsave(q->queue_lock, flags);
+
+                while (end_that_request_chunk(req, !req->errors,
+                                              le32_to_cpu(pmsg->body[1]))) ;
+                end_that_request_last(req);
+
+                dev->open_queue_depth--;
+                list_del(&ireq->queue);
+                blk_start_queue(q);
+
+                spin_unlock_irqrestore(q->queue_lock, flags);
+
+                /* Now flush the message by making it a NOP */
+                i2o_msg_nop(c, pm);
+
+                return -1;
+        }
+
+        req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
+        if (unlikely(!req)) {
+                osm_err("NULL reply received!\n");
+                return -1;
+        }
+
+        ireq = req->special;
+        dev = ireq->i2o_blk_dev;
+        q = dev->gd->queue;
+
+        if (unlikely(!dev->i2o_dev)) {
+                /*
+                 * This is HACK, but Intel Integrated RAID allows user
+                 * to delete a volume that is claimed, locked, and in use
+                 * by the OS. We have to check for a reply from a
+                 * non-existent device and flag it as an error or the system
+                 * goes kaput...
+                 */
+                req->errors++;
+                osm_warn("Data transfer to deleted device!\n");
+                spin_lock_irqsave(q->queue_lock, flags);
+                while (end_that_request_chunk
+                       (req, !req->errors, le32_to_cpu(msg->body[1]))) ;
+                end_that_request_last(req);
+
+                dev->open_queue_depth--;
+                list_del(&ireq->queue);
+                blk_start_queue(q);
+
+                spin_unlock_irqrestore(q->queue_lock, flags);
+                return -1;
+        }
+
+        /*
+         *      Lets see what is cooking. We stuffed the
+         *      request in the context.
+         */
+
+        st = le32_to_cpu(msg->body[0]) >> 24;
+
+        if (st != 0) {
+                int err;
+                char *bsa_errors[] = {
+                        "Success",
+                        "Media Error",
+                        "Failure communicating to device",
+                        "Device Failure",
+                        "Device is not ready",
+                        "Media not present",
+                        "Media is locked by another user",
+                        "Media has failed",
+                        "Failure communicating to device",
+                        "Device bus failure",
+                        "Device is locked by another user",
+                        "Device is write protected",
+                        "Device has reset",
+                        "Volume has changed, waiting for acknowledgement"
+                };
+
+                err = le32_to_cpu(msg->body[0]) & 0xffff;
+
+                /*
+                 *      Device not ready means two things. One is that the
+                 *      the thing went offline (but not a removal media)
+                 *
+                 *      The second is that you have a SuperTrak 100 and the
+                 *      firmware got constipated. Unlike standard i2o card
+                 *      setups the supertrak returns an error rather than
+                 *      blocking for the timeout in these cases.
+                 *
+                 *      Don't stick a supertrak100 into cache aggressive modes
+                 */
+
+                osm_err("block-osm: /dev/%s error: %s", dev->gd->disk_name,
+                        bsa_errors[le32_to_cpu(msg->body[0]) & 0xffff]);
+                if (le32_to_cpu(msg->body[0]) & 0x00ff0000)
+                        printk(KERN_ERR " - DDM attempted %d retries",
+                               (le32_to_cpu(msg->body[0]) >> 16) & 0x00ff);
+                printk(KERN_ERR ".\n");
+                req->errors++;
+        } else
+                req->errors = 0;
+
+        if (!end_that_request_chunk
+            (req, !req->errors, le32_to_cpu(msg->body[1]))) {
+                add_disk_randomness(req->rq_disk);
+                spin_lock_irqsave(q->queue_lock, flags);
+
+                end_that_request_last(req);
+
+                dev->open_queue_depth--;
+                list_del(&ireq->queue);
+                blk_start_queue(q);
+
+                spin_unlock_irqrestore(q->queue_lock, flags);
+
+                i2o_block_sglist_free(ireq);
+                i2o_block_request_free(ireq);
+        } else
+                osm_err("still remaining chunks\n");
+
+        return 1;
+};
+
+static void i2o_block_event(struct i2o_event *evt)
+{
+        osm_info("block-osm: event received\n");
+};
+
+/*
+ *      SCSI-CAM for ioctl geometry mapping
+ *      Duplicated with SCSI - this should be moved into somewhere common
+ *      perhaps genhd ?
+ *
+ * LBA -> CHS mapping table taken from:
+ *
+ * "Incorporating the I2O Architecture into BIOS for Intel Architecture
+ *  Platforms"
+ *
+ * This is an I2O document that is only available to I2O members,
+ * not developers.
+ *
+ * From my understanding, this is how all the I2O cards do this
+ *
+ * Disk Size      | Sectors | Heads | Cylinders
+ * ---------------+---------+-------+-------------------
+ * 1 < X <= 528M  | 63      | 16    | X/(63 * 16 * 512)
+ * 528M < X <= 1G | 63      | 32    | X/(63 * 32 * 512)
+ * 1 < X <528M    | 63      | 16    | X/(63 * 16 * 512)
+ * 1 < X <528M    | 63      | 16    | X/(63 * 16 * 512)
+ *
+ */
+#define BLOCK_SIZE_528M         1081344
+#define BLOCK_SIZE_1G           2097152
+#define BLOCK_SIZE_21G          4403200
+#define BLOCK_SIZE_42G          8806400
+#define BLOCK_SIZE_84G          17612800
+
+static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls,
+                                unsigned char *hds, unsigned char *secs)
+{
+        unsigned long heads, sectors, cylinders;
+
+        sectors = 63L;          /* Maximize sectors per track */
+        if (capacity <= BLOCK_SIZE_528M)
+                heads = 16;
+        else if (capacity <= BLOCK_SIZE_1G)
+                heads = 32;
+        else if (capacity <= BLOCK_SIZE_21G)
+                heads = 64;
+        else if (capacity <= BLOCK_SIZE_42G)
+                heads = 128;
+        else
+                heads = 255;
+
+        cylinders = (unsigned long)capacity / (heads * sectors);
+
+        *cyls = (unsigned short)cylinders;      /* Stuff return values */
+        *secs = (unsigned char)sectors;
+        *hds = (unsigned char)heads;
+}
+
+/**
+ *      i2o_block_open - Open the block device
+ *
+ *      Power up the device, mount and lock the media. This function is called,
+ *      if the block device is opened for access.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_open(struct inode *inode, struct file *file)
+{
+        struct i2o_block_device *dev = inode->i_bdev->bd_disk->private_data;
+
+        if (!dev->i2o_dev)
+                return -ENODEV;
+
+        if (dev->power > 0x1f)
+                i2o_block_device_power(dev, 0x02);
+
+        i2o_block_device_mount(dev->i2o_dev, -1);
+
+        i2o_block_device_lock(dev->i2o_dev, -1);
+
+        osm_debug("Ready.\n");
+
+        return 0;
+};
+
+/**
+ *      i2o_block_release - Release the I2O block device
+ *
+ *      Unlock and unmount the media, and power down the device. Gets called if
+ *      the block device is closed.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_release(struct inode *inode, struct file *file)
+{
+        struct gendisk *disk = inode->i_bdev->bd_disk;
+        struct i2o_block_device *dev = disk->private_data;
+        u8 operation;
+
+        /*
+         * This is to deail with the case of an application
+         * opening a device and then the device dissapears while
+         * it's in use, and then the application tries to release
+         * it.  ex: Unmounting a deleted RAID volume at reboot.
+         * If we send messages, it will just cause FAILs since
+         * the TID no longer exists.
+         */
+        if (!dev->i2o_dev)
+                return 0;
+
+        i2o_block_device_flush(dev->i2o_dev);
+
+        i2o_block_device_unlock(dev->i2o_dev, -1);
+
+        if (dev->flags & (1 << 3 | 1 << 4))     /* Removable */
+                operation = 0x21;
+        else
+                operation = 0x24;
+
+        i2o_block_device_power(dev, operation);
+
+        return 0;
+}
+
+/**
+ *      i2o_block_ioctl - Issue device specific ioctl calls.
+ *      @cmd: ioctl command
+ *      @arg: arg
+ *
+ *      Handles ioctl request for the block device.
+ *
+ *      Return 0 on success or negative error on failure.
+ */
+static int i2o_block_ioctl(struct inode *inode, struct file *file,
+                           unsigned int cmd, unsigned long arg)
+{
+        struct gendisk *disk = inode->i_bdev->bd_disk;
+        struct i2o_block_device *dev = disk->private_data;
+        void __user *argp = (void __user *)arg;
+
+        /* Anyone capable of this syscall can do *real bad* things */
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        switch (cmd) {
+        case HDIO_GETGEO:
+                {
+                        struct hd_geometry g;
+                        i2o_block_biosparam(get_capacity(disk),
+                                            &g.cylinders, &g.heads, &g.sectors);
+                        g.start = get_start_sect(inode->i_bdev);
+                        return copy_to_user(argp, &g, sizeof(g)) ? -EFAULT : 0;
+                }
+
+        case BLKI2OGRSTRAT:
+                return put_user(dev->rcache, (int __user *)arg);
+        case BLKI2OGWSTRAT:
+                return put_user(dev->wcache, (int __user *)arg);
+        case BLKI2OSRSTRAT:
+                if (arg < 0 || arg > CACHE_SMARTFETCH)
+                        return -EINVAL;
+                dev->rcache = arg;
+                break;
+        case BLKI2OSWSTRAT:
+                if (arg != 0
+                    && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK))
+                        return -EINVAL;
+                dev->wcache = arg;
+                break;
+        }
+        return -ENOTTY;
+};
+
+/**
+ *      i2o_block_media_changed - Have we seen a media change?
+ *      @disk: gendisk which should be verified
+ *
+ *      Verifies if the media has changed.
+ *
+ *      Returns 1 if the media was changed or 0 otherwise.
+ */
+static int i2o_block_media_changed(struct gendisk *disk)
+{
+        struct i2o_block_device *p = disk->private_data;
+
+        if (p->media_change_flag) {
+                p->media_change_flag = 0;
+                return 1;
+        }
+        return 0;
+}
+
+/**
+ *      i2o_block_transfer - Transfer a request to/from the I2O controller
+ *      @req: the request which should be transfered
+ *
+ *      This function converts the request into a I2O message. The necessary
+ *      DMA buffers are allocated and after everything is setup post the message
+ *      to the I2O controller. No cleanup is done by this function. It is done
+ *      on the interrupt side when the reply arrives.
+ *
+ *      Return 0 on success or negative error code on failure.
+ */
+static int i2o_block_transfer(struct request *req)
+{
+        struct i2o_block_device *dev = req->rq_disk->private_data;
+        struct i2o_controller *c = dev->i2o_dev->iop;
+        int tid = dev->i2o_dev->lct_data.tid;
+        struct i2o_message __iomem *msg;
+        void __iomem *mptr;
+        struct i2o_block_request *ireq = req->special;
+        struct scatterlist *sg;
+        int sgnum;
+        int i;
+        u32 m;
+        u32 tcntxt;
+        u32 sg_flags;
+        int rc;
+
+        m = i2o_msg_get(c, &msg);
+        if (m == I2O_QUEUE_EMPTY) {
+                rc = -EBUSY;
+                goto exit;
+        }
+
+        tcntxt = i2o_cntxt_list_add(c, req);
+        if (!tcntxt) {
+                rc = -ENOMEM;
+                goto nop_msg;
+        }
+
+        if ((sgnum = i2o_block_sglist_alloc(ireq)) <= 0) {
+                rc = -ENOMEM;
+                goto context_remove;
+        }
+
+        /* Build the message based on the request. */
+        writel(i2o_block_driver.context, &msg->u.s.icntxt);
+        writel(tcntxt, &msg->u.s.tcntxt);
+        writel(req->nr_sectors << 9, &msg->body[1]);
+
+        writel((((u64) req->sector) << 9) & 0xffffffff, &msg->body[2]);
+        writel(req->sector >> 23, &msg->body[3]);
+
+        mptr = &msg->body[4];
+
+        sg = ireq->sg_table;
+
+        if (rq_data_dir(req) == READ) {
+                writel(I2O_CMD_BLOCK_READ << 24 | HOST_TID << 12 | tid,
+                       &msg->u.head[1]);
+                sg_flags = 0x10000000;
+                switch (dev->rcache) {
+                case CACHE_NULL:
+                        writel(0, &msg->body[0]);
+                        break;
+                case CACHE_PREFETCH:
+                        writel(0x201F0008, &msg->body[0]);
+                        break;
+                case CACHE_SMARTFETCH:
+                        if (req->nr_sectors > 16)
+                                writel(0x201F0008, &msg->body[0]);
+                        else
+                                writel(0x001F0000, &msg->body[0]);
+                        break;
+                }
+        } else {
+                writel(I2O_CMD_BLOCK_WRITE << 24 | HOST_TID << 12 | tid,
+                       &msg->u.head[1]);
+                sg_flags = 0x14000000;
+                switch (dev->wcache) {
+                case CACHE_NULL:
+                        writel(0, &msg->body[0]);
+                        break;
+                case CACHE_WRITETHROUGH:
+                        writel(0x001F0008, &msg->body[0]);
+                        break;
+                case CACHE_WRITEBACK:
+                        writel(0x001F0010, &msg->body[0]);
+                        break;
+                case CACHE_SMARTBACK:
+                        if (req->nr_sectors > 16)
+                                writel(0x001F0004, &msg->body[0]);
+                        else
+                                writel(0x001F0010, &msg->body[0]);
+                        break;
+                case CACHE_SMARTTHROUGH:
+                        if (req->nr_sectors > 16)
+                                writel(0x001F0004, &msg->body[0]);
+                        else
+                                writel(0x001F0010, &msg->body[0]);
+                }
+        }
+
+        for (i = sgnum; i > 0; i--) {
+                if (i == 1)
+                        sg_flags |= 0x80000000;
+                writel(sg_flags | sg_dma_len(sg), mptr);
+                writel(sg_dma_address(sg), mptr + 4);
+                mptr += 8;
+                sg++;
+        }
+
+        writel(I2O_MESSAGE_SIZE
+               (((unsigned long)mptr -
+                 (unsigned long)&msg->u.head[0]) >> 2) | SGL_OFFSET_8,
+               &msg->u.head[0]);
+
+        list_add_tail(&ireq->queue, &dev->open_queue);
+        dev->open_queue_depth++;
+
+        i2o_msg_post(c, m);
+
+        return 0;
+
+      context_remove:
+        i2o_cntxt_list_remove(c, req);
+
+      nop_msg:
+        i2o_msg_nop(c, m);
+
+      exit:
+        return rc;
+};
+
+/**
+ *      i2o_block_request_fn - request queue handling function
+ *      q: request queue from which the request could be fetched
+ *
+ *      Takes the next request from the queue, transfers it and if no error
+ *      occurs dequeue it from the queue. On arrival of the reply the message
+ *      will be processed further. If an error occurs requeue the request.
+ */
+static void i2o_block_request_fn(struct request_queue *q)
+{
+        struct request *req;
+
+        while (!blk_queue_plugged(q)) {
+                req = elv_next_request(q);
+                if (!req)
+                        break;
+
+                if (blk_fs_request(req)) {
+                        struct i2o_block_delayed_request *dreq;
+                        struct i2o_block_request *ireq = req->special;
+                        unsigned int queue_depth;
+
+                        queue_depth = ireq->i2o_blk_dev->open_queue_depth;
+
+                        if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS)
+                                if (!i2o_block_transfer(req)) {
+                                        blkdev_dequeue_request(req);
+                                        continue;
+                                }
+
+                        if (queue_depth)
+                                break;
+
+                        /* stop the queue and retry later */
+                        dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC);
+                        if (!dreq)
+                                continue;
+
+                        dreq->queue = q;
+                        INIT_WORK(&dreq->work, i2o_block_delayed_request_fn,
+                                  dreq);
+
+                        osm_info("transfer error\n");
+                        if (!queue_delayed_work(i2o_block_driver.event_queue,
+                                                &dreq->work,
+                                                I2O_BLOCK_RETRY_TIME))
+                                kfree(dreq);
+                        else {
+                                blk_stop_queue(q);
+                                break;
+                        }
+                } else
+                        end_request(req, 0);
+        }
+};
+
+/* I2O Block device operations definition */
+static struct block_device_operations i2o_block_fops = {
+        .owner = THIS_MODULE,
+        .open = i2o_block_open,
+        .release = i2o_block_release,
+        .ioctl = i2o_block_ioctl,
+        .media_changed = i2o_block_media_changed
+};
+
+/**
+ *      i2o_block_device_alloc - Allocate memory for a I2O Block device
+ *
+ *      Allocate memory for the i2o_block_device struct, gendisk and request
+ *      queue and initialize them as far as no additional information is needed.
+ *
+ *      Returns a pointer to the allocated I2O Block device on succes or a
+ *      negative error code on failure.
+ */
+static struct i2o_block_device *i2o_block_device_alloc(void)
+{
+        struct i2o_block_device *dev;
+        struct gendisk *gd;
+        struct request_queue *queue;
+        int rc;
+
+        dev = kmalloc(sizeof(*dev), GFP_KERNEL);
+        if (!dev) {
+                osm_err("Insufficient memory to allocate I2O Block disk.\n");
+                rc = -ENOMEM;
+                goto exit;
+        }
+        memset(dev, 0, sizeof(*dev));
+
+        INIT_LIST_HEAD(&dev->open_queue);
+        spin_lock_init(&dev->lock);
+        dev->rcache = CACHE_PREFETCH;
+        dev->wcache = CACHE_WRITEBACK;
+
+        /* allocate a gendisk with 16 partitions */
+        gd = alloc_disk(16);
+        if (!gd) {
+                osm_err("Insufficient memory to allocate gendisk.\n");
+                rc = -ENOMEM;
+                goto cleanup_dev;
+        }
+
+        /* initialize the request queue */
+        queue = blk_init_queue(i2o_block_request_fn, &dev->lock);
+        if (!queue) {
+                osm_err("Insufficient memory to allocate request queue.\n");
+                rc = -ENOMEM;
+                goto cleanup_queue;
+        }
+
+        blk_queue_prep_rq(queue, i2o_block_prep_req_fn);
+
+        gd->major = I2O_MAJOR;
+        gd->queue = queue;
+        gd->fops = &i2o_block_fops;
+        gd->private_data = dev;
+
+        dev->gd = gd;
+
+        return dev;
+
+      cleanup_queue:
+        put_disk(gd);
+
+      cleanup_dev:
+        kfree(dev);
+
+      exit:
+        return ERR_PTR(rc);
+};
+
+/**
+ *      i2o_block_probe - verify if dev is a I2O Block device and install it
+ *      @dev: device to verify if it is a I2O Block device
+ *
+ *      We only verify if the user_tid of the device is 0xfff and then install
+ *      the device. Otherwise it is used by some other device (e. g. RAID).
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int i2o_block_probe(struct device *dev)
+{
+        struct i2o_device *i2o_dev = to_i2o_device(dev);
+        struct i2o_block_device *i2o_blk_dev;
+        struct i2o_controller *c = i2o_dev->iop;
+        struct gendisk *gd;
+        struct request_queue *queue;
+        static int unit = 0;
+        int rc;
+        u64 size;
+        u32 blocksize;
+        u16 power;
+        u32 flags, status;
+        int segments;
+
+        /* skip devices which are used by IOP */
+        if (i2o_dev->lct_data.user_tid != 0xfff) {
+                osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid);
+                return -ENODEV;
+        }
+
+        osm_info("New device detected (TID: %03x)\n", i2o_dev->lct_data.tid);
+
+        if (i2o_device_claim(i2o_dev)) {
+                osm_warn("Unable to claim device. Installation aborted\n");
+                rc = -EFAULT;
+                goto exit;
+        }
+
+        i2o_blk_dev = i2o_block_device_alloc();
+        if (IS_ERR(i2o_blk_dev)) {
+                osm_err("could not alloc a new I2O block device");
+                rc = PTR_ERR(i2o_blk_dev);
+                goto claim_release;
+        }
+
+        i2o_blk_dev->i2o_dev = i2o_dev;
+        dev_set_drvdata(dev, i2o_blk_dev);
+
+        /* setup gendisk */
+        gd = i2o_blk_dev->gd;
+        gd->first_minor = unit << 4;
+        sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit);
+        sprintf(gd->devfs_name, "i2o/hd%c", 'a' + unit);
+        gd->driverfs_dev = &i2o_dev->device;
+
+        /* setup request queue */
+        queue = gd->queue;
+        queue->queuedata = i2o_blk_dev;
+
+        blk_queue_max_phys_segments(queue, I2O_MAX_SEGMENTS);
+        blk_queue_max_sectors(queue, I2O_MAX_SECTORS);
+
+        if (c->short_req)
+                segments = 8;
+        else {
+                i2o_status_block *sb;
+
+                sb = c->status_block.virt;
+
+                segments = (sb->inbound_frame_size -
+                            sizeof(struct i2o_message) / 4 - 4) / 2;
+        }
+
+        blk_queue_max_hw_segments(queue, segments);
+
+        osm_debug("max sectors = %d\n", I2O_MAX_SECTORS);
+        osm_debug("phys segments = %d\n", I2O_MAX_SEGMENTS);
+        osm_debug("hw segments = %d\n", segments);
+
+        /*
+         *      Ask for the current media data. If that isn't supported
+         *      then we ask for the device capacity data
+         */
+        if (i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) != 0
+            || i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) != 0) {
+                i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4);
+                i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8);
+        }
+        osm_debug("blocksize = %d\n", blocksize);
+
+        if (i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2))
+                power = 0;
+        i2o_parm_field_get(i2o_dev, 0x0000, 5, &flags, 4);
+        i2o_parm_field_get(i2o_dev, 0x0000, 6, &status, 4);
+
+        set_capacity(gd, size >> 9);
+
+        i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff);
+
+        add_disk(gd);
+
+        unit++;
+
+        return 0;
+
+      claim_release:
+        i2o_device_claim_release(i2o_dev);
+
+      exit:
+        return rc;
+};
+
+/* Block OSM driver struct */
+static struct i2o_driver i2o_block_driver = {
+        .name = OSM_NAME,
+        .event = i2o_block_event,
+        .reply = i2o_block_reply,
+        .classes = i2o_block_class_id,
+        .driver = {
+                   .probe = i2o_block_probe,
+                   .remove = i2o_block_remove,
+                   },
+};
+
+/**
+ *      i2o_block_init - Block OSM initialization function
+ *
+ *      Allocate the slab and mempool for request structs, registers i2o_block
+ *      block device and finally register the Block OSM in the I2O core.
+ *
+ *      Returns 0 on success or negative error code on failure.
+ */
+static int __init i2o_block_init(void)
+{
+        int rc;
+        int size;
+
+        printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
+
+        /* Allocate request mempool and slab */
+        size = sizeof(struct i2o_block_request);
+        i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0,
+                                                  SLAB_HWCACHE_ALIGN, NULL,
+                                                  NULL);
+        if (!i2o_blk_req_pool.slab) {
+                osm_err("can't init request slab\n");
+                rc = -ENOMEM;
+                goto exit;
+        }
+
+        i2o_blk_req_pool.pool = mempool_create(I2O_REQ_MEMPOOL_SIZE,
+                                               mempool_alloc_slab,
+                                               mempool_free_slab,
+                                               i2o_blk_req_pool.slab);
+        if (!i2o_blk_req_pool.pool) {
+                osm_err("can't init request mempool\n");
+                rc = -ENOMEM;
+                goto free_slab;
+        }
+
+        /* Register the block device interfaces */
+        rc = register_blkdev(I2O_MAJOR, "i2o_block");
+        if (rc) {
+                osm_err("unable to register block device\n");
+                goto free_mempool;
+        }
+#ifdef MODULE
+        osm_info("registered device at major %d\n", I2O_MAJOR);
+#endif
+
+        /* Register Block OSM into I2O core */
+        rc = i2o_driver_register(&i2o_block_driver);
+        if (rc) {
+                osm_err("Could not register Block driver\n");
+                goto unregister_blkdev;
+        }
+
+        return 0;
+
+      unregister_blkdev:
+        unregister_blkdev(I2O_MAJOR, "i2o_block");
+
+      free_mempool:
+        mempool_destroy(i2o_blk_req_pool.pool);
+
+      free_slab:
+        kmem_cache_destroy(i2o_blk_req_pool.slab);
+
+      exit:
+        return rc;
+};
+
+/**
+ *      i2o_block_exit - Block OSM exit function
+ *
+ *      Unregisters Block OSM from I2O core, unregisters i2o_block block device
+ *      and frees the mempool and slab.
+ */
+static void __exit i2o_block_exit(void)
+{
+        /* Unregister I2O Block OSM from I2O core */
+        i2o_driver_unregister(&i2o_block_driver);
+
+        /* Unregister block device */
+        unregister_blkdev(I2O_MAJOR, "i2o_block");
+
+        /* Free request mempool and slab */
+        mempool_destroy(i2o_blk_req_pool.pool);
+        kmem_cache_destroy(i2o_blk_req_pool.slab);
+};
+
+MODULE_AUTHOR("Red Hat");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(OSM_DESCRIPTION);
+MODULE_VERSION(OSM_VERSION);
+
+module_init(i2o_block_init);
+module_exit(i2o_block_exit);